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Bentone
Pump operating principle for
A2L 65C - 75C
The SUNTEC A2L oil pump has two nozzle outlets. It
incorporates two blocking solenoid
valves with in-line cut-off function, one for each nozzle
outlet.
Applications
-
Light oil, B10 heating oil/biofuel blend (as defined
in DIN V51603-6) and kerosene.
-
Two nozzle outlets.
-
Two independent blocking solenoid valves.
-
A sole regulator for both nozzle lines
Pump operating principle
The gear set draws oil from the tank through the built-in
filter and transfers it to the nozzle lines via the cut-off
solenoid valves. A pressure regulating valve is used to
bypass all oil which is not required at the nozzles.
In two-pipe operation, the by-pass plug must be fitted
in the return port, which ensures that the oil bypassed
by the regulating valve is returned to the tank and the
suction line flow is equal to the gear set capacity.
In one-pipe operation (by-pass plug removed and return
plugged), the oil which does not go through the nozzle
lines is returned directly to the gear inlet and the suction
line flow is equal to the sum of the 2 nozzle flows
Bleed
Bleeding in two-pipe operation is automatic : it is
assured by a bleed flat on the piston.
In one-pipe operation, the plug of a pressure gauge port
must be loosened until the air is evacuated from the
system
Cut-of
The solenoid valves of the A2L pump are of the ”normally
closed” type. Each solenoid valve is situated in one
nozzle line. This design ensures extremely fast response
and the switching can be selected according to the
burner operating sequence and is independent of motor
speed.
When the solenoids are non-activated, the valves are
closed and all oil pressurized by the gear set passes
through the regulator to suction or to the return line,
depending upon pipe arrangement.
As soon as the solenoids are activated, oil passes to
the nozzle lines at the pressure set by the pressure
regulating valve. The two solenoid valves can be
operated independently
